Apparatus for making paper.



G. SCHENCK. In.

APPARATUS FOR MAKING PAPER. APPLICATION FILED HMI. I8. 1915. 1,267,701 Patented-my 28,1913

4 ,lha/8212302? UNITED STATES PATENT OFFICE.

GABRET SCHENCK, JB., 0F MILLINOCKET, MAINE, ASSIGNGB 10 GREAT NORTHERN PAPER COMPANY; OF MILLINOCKET, MAINE, A CORPORATION 0F MAINE.

APPARATUS FOB MAKING PAPER.

Speclcation of Letters Patent.

Patented May 28, 1918.

To all whom it may concern Be it known that I, GAimE'r SGHENCK, Jr., a citizen of the United States, residing at Millinocket, in the county of Penobscot and State of Maine, have invented an Improvement in A paratus for Making Paper, of which the ollowing is a specification.

This invention relates to an improvement in the drying portions of that type of papermaking machine in which the web is led over a series of rotating cylindrical driers, and to a process for causing the web which has passed from a drying cylinder into contact with a scraper or stripper to leave the stripper and pass to the next cylinder. It can be readily applied to machines of the type shown in Letters Patent to Charles E. Pope, No. 1,113,908, dated October 13, 1914, but is applicable to all machines of the general type above described.

Instarting up such a papermaking machine, or in rethreading the web through the driers after a break, the front end of the paper, as it passes around the irst drier toward the second drier, is detached from or stripped of the first drier by a scraper or stripper. This stripper is usually hot and the web at this point is moist, and as the course of the web is or may be upward against the force of gravity, the momentum o the web, due to its speed, may not be sufficient to carry it to the second drier, in all cases. If the web does stick to the stripper, it ma 'be diicult, and at very high speeds, may e im ossible, to detach it from the stripper an pass it to the secondl drier by a manual operation, intime to prevent the clo ging of the machine. My invention is desi ed toavoid this diculty.

I ave found that by associating with the stripper, means whereby a blast or blasts of air are properly directed relative thereto, that the web will be deflected in such manner as to prevent it from sticking to the stri per, that is to say, in case the web has suc tendency; or if by any reason, the web does stick tothe stripper, it will be deiected relative thereto so as to be detached therefrom, and in both instances, the deected web will be directed toward the next drying cylinder for engagement therewith. For iiistanoe, the scrapn or stripping' blade may 'be perforated an streams or jets of air driven through theperforations at a considarable velocity, pre

erably in a more or less upward direction, or in a direction away from the blade and toward the next cylinder, thereby to deflect the web and revent it from adhering to the blade or, i adhering thereto, to detach it therefrom, so that the deflected web will easily and surely pass from one drying cylinder to the next, and

thus proceed through the machine as intended.

Each stripper, where the web is liable to cause trouble, should have associated with it, means involvin this inventionbut there is little chance o the difiiculty occurring except in the first few drying cylinders of the set, when the machine is started up, or after a break.

My invention is especially applicable to fast running machines, and in such machines I refer to arrange the driers so that the welb is delivered first to a lower drier, passing between the apron and drier, in a wellknown way, as by passing over a roller and running down between the apron and the drier. When this arrangement is used,how ever, the passage from the first drier to the second drier is upward, and as the web is moist and the stripper is hot, the momentum of the web will not always overcome both the force of gravity and the tendency of the web to stick to the stripper, and as the web is or may be, traveling at the rate of speed of over 700 feet a minute, a stoppage of a second will cause more than ten feet of paper to accumulate in the narrow space between the driers and clog the machine so that it must be cleared before the web can be carried alon properl I have found, however, that by t e use o my device this clogging can be absolutely prevented, even at the drier, and with much greater certainty at each subsequent drier. In practice, however, I have found it unnecessary to use my invention beyond the first few driers, but i owin to the character of the web, any trouble o the nature which it is the ob]ect of this invention to remove, is found to occur, the invention should be applied to every stripper where the diiiculty is liable to occur.

In the drawing, wherein a satisfactory embodiment of m invention is shown,

Figure 1 is a si e elevation of the stripper applied to one of the driers.

Fig. 2 is an enlarged side-view. Fig. 3 is a front e ovation, and,

Fig. 4 is a transverse vertical section.

1 represents, in conventional form, the drying-cylinders, two tiers of cylinders being here shown, 2 the aprons, and 3 the rolls arranged between the cylinders over which the aprons pass, all of which elements are or may be of any usual or suitable construction and arrangement.

4 is the scraping or stripping-blade which is associated with `any one or more of the dr ing-cylinders of the set, it being disposed su stantially tangential with respect to the surface of the cylinder. It is preferably supported by a rod 5, which is pivotally supported preferably in the'n'iain frame of the machine and Whlch has associated with it a spring 6, here shown as attached at one end to an arm 7, secured to the rod, and at the other end to the frame, thereby to hold the blade in engagement with the .surface of the cylinder in a yielding manner. The blade 4 has numerous perforations 8, arranged in a row, throughout a reater or lesser portion of its length, usual y, however, belng arranged at one end-portion of the blade. The reason why it is unnecessary to have the en tire blade erforated throughout the width of the mac ine is that in starting up after a break it is usual to passalong a narrow strip only, and I have found that after this strip has been passed alon and is running properly, that commonly t e full width of the web will go through the machine with out difliculty. This is particularly true with driers arranged substantially as shown in the drawing, or in such other way that the strippers coperate with the aprons and driers in leading the web along. With the aid of my invention, after the web is run ning at full Width through the machine, it is usually unnecessary to continue the use of the air current, but if any diiliculty occurs owing to the sticking of the web nn the stripper blades, the air current should be applied for so much of the blade as is found necessary and. should be kept up as long as is necessary. It will be understood that more than one row of perforations may be employed, if desired, and furthermore, said qperforations may he arranged in any other desi red manner.

An airipe 9 is arranged back of the blade which is substantially coextensive with the length of the row of perforations, and

said air-pipe has numerous perforations l0,

arrangedito register substantially with the pcrforations of the blade` thus to admit of jets or streams ofrair which issue from the pcrlorations in the pipe to projcctthreugh 1in: periloraions in thc blade. Said air-pipe is connected with an air-supply l', which is connected will; any suitable form or typo of air-l' n'ci11g or compressing-dcvirc, so that the jets or blasts nl air are caused to project through the pel'l'orntious in the blade with considerable velocity. (Ehe. perforations in the blade are preferably of larger diameter than the perforations in the air-pipe, so that 'the jets or blasts of air which issue therefrom will diverge, and thereby cover a large area, the intent being to have the jets or blasts of air-.suliciently numerous, land to cover sulilcient area to form substantially a continuous sheet for engaging the web which passes over the blade.

These jets or blasts of air, or it may be a sheet, which is the equivalent thereof, deflects the web in such manner as to prevent; it from sticking to the blade, any reason, it should stick to the blade, to detach it therefrom, and in either case,v to deflect and direct it toward the next drying-cylinder. In case the next drying-cylinder is in a higher plane, thru the perforations in thc blade and also in the air-pipe will be arranged in a diagonal direction, tending upward, so as to deflect the web in a corresponding direction. Air-forcing devices will be associated with all those stripping or scrapingblades, which it is found necessary or desirable.

From the foregoing it will be apparent that the invention consists broadly in means for passing a current or currents of air in such a manner as to prevent the web from sticking upon the surface of the scraper-A blade, and in this broad aspect is not limited to any special form, arrangement, or number of air passages, provided that the air is so directed as to deflect the web awa from the scraper-blade, rather than agalnst it; nor is my invention limited to any special arrangement or relative disposition of the dryingvcylinders.

Other gases may be used instead of air and the use. of such other gases is included within the terni airu in this specification.

1. In a paper-inciting machine, having ro tatable drying cylinders arranged in tiers and endless felts for the respective tiers eonlac-ting and moving synchronously with the outer surfaces of the cylinders, thecombinf lion with a drying cylinder in one tier and u sul'isequcnt drying cylinder :in the other tier, of a blade arranged adjacent te the earlier drying cylinder, to cause the moist web to leave the earlier cylinder and direct it toward the subsequent drying c 'linden said blade having air passages, an means arranged to blow :i'ir through said :n.d direct it between the subsequent drying cylinder and its i'clts so as lo be led around the subsequent drying cylinder. i

:L ln a papcrni-.ilfing machine having dryingr cyliinlcrs arranged in tiers, the coinbination with a drying cylinder, of a blade associated tlufrewith, arranged to cause the uch to leaw the cylinder, said blade having or, in case, for

I assages," torce the ,minst web away from tie blade numerous perforations, and an air-pipe arw ranged back of said blade having corresponding perforations, and air supplying means connected with said pipe, whereby air may be forcibly projected through the erforations of said pipe and blade to de ect the web and direct it to another drying cylinder.

3. In a papermaking machine having a series of drying cylinders arranged in tiers, and felts for the respective tiers, the combination with a drying cylinder of the lower tier, and a drying cylinder of the higher tier, of means associated with the lower drying cylinder and arranged to strip the web therefrom and to direct it to contact with and be led around between the upper felt and the higher drying cylinder, and pneumatic means associated with said strippingmeans to project currents of air in a direction to blow the stripped web toward the higher drying cylinder. V

4. In a papermaking machine having a series of rotatable drying cylinders arranged in tiers, and guiding means respectively associated with the drying cylinders of each tier, the combination of a drying cylinder of the .lower tier`r and a drying cylinder of the higher tier, and the guiding-means of both tiers, of a blade associated with the lower drying cylinder and arranged to strip the web therefrom and to direct it into the space between the higher drying cylinder and the guiding-means, said blade having perforations through which a blast of air is forced,

thereby to engage the under side of the web and prevent it from adhering to the blade, and also to deflect it in a direction to cause it to enter said space, thus to insure the web being carried aroun'l the higher drying cylinder, and means to force the air through the perforations of said blade.

5. In a papermaking machine having a series of rotatable drying cylinders arranged in tiers, and traveling felts arranged to move synchronously in connection with said drying cylinders of the respective tiers and guide the web around the' cylinders, the combination with a drying cylinder of the lower tier and a drying cylinder of the higher tier and the traveling felts of both tiers, of stripping means associated with said lower drying cylinder and arranged to cause the web to leave said lower drying cylinder, and means to direct a blast of air against the under side of said web in a direction radially outward from said lower drying cylinder and toward the biglit between the higher drying cylinder and the uiding felt so as to prevent the web from a hering to said strippin means and to direct Said web toward the igher drying cylinder.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

WILLIAM MARDEN, FLORENCE L. ZraMANN. 

